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Developing an Application with J2ME Technology. Scott Palmer, Nat Panchee, Judy Sullivan, Karen Thabet, Sten Westgard. Java - “One size does not fit all”. Java Technology - Editions. Memory footprint decreases . J2ME - Characteristics. J2ME maintains qualities of Java Technology

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Developing an Application with J2ME Technology

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Developing an Application with J2ME Technology

Scott Palmer, Nat Panchee, Judy Sullivan,

Karen Thabet, Sten Westgard


Java -“One size does not fit all”


Java Technology - Editions

Memory footprint decreases


J2ME - Characteristics

  • J2ME maintains qualities of Java Technology

  • Consistency across products

  • Portability of code


J2ME - Characteristics

  • Run anywhere, anytime and on any device

  • Safe network delivery

  • Upward scalability with J2SE and J2EE technology

  • OOP base language


What is a Configuration?

  • Specifies Java Programming language features supported

  • Specifies the JVM features supported

  • Specifies the basic Java libraries and APIs supported


J2ME Configurations

  • Connected Device Configuration (CDC)

  • Connected Limited Device Configuration (CLDC)

  • Purpose:

    • CDC – High end consumer devices

    • CDLC – Low end consumer devices


Java2 Micro Edition - Architecture


CDC

  • 32 bit processor

  • >.5MB (ROM+RAM)

  • JVM support

  • High bandwidth network connectivity

  • Devices include:

    • Communicators

    • Next Generation Smart Phones

    • Home Appliances

    • Car Navigation Systems


CLDC

  • 16-32 bit processor

  • >160-512kB (ROM+RAM)

  • KVM support

  • Limited power/battery, network, GUI, Java class libraries

  • Devices include:

    • Cell phones

    • Personal Digital Assistants

    • Pagers


America Online

Bull

Ericsson

Fujitsu

Matsushita

Mitsubishi

Motorola

Nokia

NTT DoCoMo

Oracle

Palm Computing

RIM

Samsung

Sharp

Siemens

Sony

SunMicrosystems

Symbian

CLDC Expert Group


CLDC Packages

  • CLDC packages:

    • java.lang

    • java.io

    • java.util

    • javax.microedition.io


CLDC

  • CLDC limitations:

    • No Floating-point Support

    • No Finalization

    • Error Handling Limitations

    • Limited Internationalization Support


MIDP – Mobile Information Device Profile

MIDP + CLDC =

Part of J2ME Runtime Environment

MIDP addresses:

  • User Interface

  • Persistent storage

  • Networking

  • Application model


MIDP Packages

MIDP Packages:

  • javax.micoredition.io

  • javax.microedition.midlet

  • javax.microedition.lcdui

  • javax.microedition.rms


What is a MIDlet?

  • MIDP Application = MIDlet

  • MIDlet is similar to applet.

  • MIDlet Structure:

    • startApp()

    • pauseApp()

    • destroyApp(boolean unconditional)


Paused

pauseApp( )

startApp( )

Active

destroyApp( )

destroyApp( )

Destroyed

MIDlet’s Life Cycle


Hello Midlet

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class HelloMidlet extends MIDlet

{

private Display display;

TextBox box = null;

public HelloMidlet()

{

}

public void startApp()

{

display = display.getDisplay(this);

box = new TextBox("Midlet Example", "Hello CS616", 20, 0);

display.setCurrent(box);

}

public void pauseApp()

{

}

public void destroyApp(boolean unconditional)

{

}

}


Hello Midlet


J2ME Wireless Toolkit


Developer Opportunities

  • Mobile Internet services

  • Value added services

  • Business to business apps


A Wireless “Safe Home”


Java Enabled Device Future

“In 2002, Nokia will deliver more than 50 million Java enable phones; more than 100 million deliveries by end of 2003.”

Pekka Ala-Pietila,

Nokia President, JavaOne, 2001


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